bootstrap 4: center inline form inside a jumbotron

Use the justify-content-center helper class on the form. That will center the contents with the flex property justify-content: center;

#home{
  background-image: url('../img/jumbotron-bkg-2.jpg');
  margin-top: 50px;
  text-align: center;
}
<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" rel="stylesheet"/>
<div class="jumbotron" id="home">
  <h1 class="display-3">My Awesome App!</h1>
  <p class="lead">This is why you should download this fantastic app!</p>
  <hr class="my-4">
  <p>Want to know more? Join our mailing list!</p>
  <form class="form-inline justify-content-center">
    <label class="sr-only" for="yourEmail">Email</label>
    <div class="input-group mb-2 mr-sm-2 mb-sm-0">
      <div class="input-group-addon">@</div>
      <input type="text" class="form-control" id="yourEmail" placeholder="Your Email">
    </div>
    <button type="button" class="btn btn-primary my-2 my-sm-0">Sign Up</button>
  </form>
</div>

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